Can't start up?

[Ayak]

Okay, so I had the "BOOTmgr is compressed" Error message, and after hours of browsing forums and trying many things, I got rid of it. I then returned the boot priority order to default, and when I try to boot, nothing happens.
It starts up, I get the ACER screen, and it's booting, but when it gets on it just has a flashing "_" In the top left corner, and nothing happens. I did system restore, but there was a point it went back to.
I can't get on, Install vista again, install xp, or ubuntu, either. (I was planning on downgrading anyhow, but when I reboot to install XP, I got the error message. I haven't ever heard of anyone else getting this when I looked through forums, and on vistaforums, no-one replied to my post. Any help, or suggestions. Questions can be answered when possible. Thanks.

[jazz836062]

I would double check your BIOS and make sure that the correct HD is booting first. The one that has Vista on it. If it is, that is leading me to believe, in your efforts to get rid of the "BOOTmgr is compressed" error you accidentally deleted it.

If your BIOS is correct I would try putting a Vista DVD in the drive and booting from it and selecting "Repair my computer" then selecting Startup repair. Let us know if that works.